@misc{indiciaef106f8115980,
  title = {Method and apparatus for testing surface characteristics of a material},
  author = {Johnson, David L. and Kersker, Karl D. and Richardson, David E. and Stratton, Troy C.},
  year = {2006},
  url = {https://ntrs.nasa.gov/citations/20080008681},
  note = {Source identifier: 20080008681}
}